If you don't cut this, and you end up eating the whole thing, technically you only had one piece. What am I?

I am bought by the yard but worn by the foot. What am I?

One guards a message folded tight, one rests where sea and stone unite. Though one’s pressed in wax and one meets foam, what single word can call both home?

I have a head, but no brains. I have a body, but no bones. The harder you hit me, the better I do my job, but if you hit me wrong, I’ll bend or break.

I have many panes but no aches or pains, I hold the summer sun while winter reigns. I’m a glass-walled home where the sprouts can grow, Keeping them warm while there’s frost and snow.